CPT® Code 78647

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Cerebrospinal fluid (CSF) flow imaging is a diagnostic procedure that utilizes single photon emission computed tomography (SPECT) to visualize the movement of cerebrospinal fluid within the brain and spinal canal. This imaging technique employs a radiolabeled isotope tracer, which is introduced into the CSF through a lumbar puncture. The primary purpose of this study is to identify any abnormalities in CSF flow, which may include conditions such as communicating and non-communicating hydrocephalus, as well as fistulas that may connect a CSF reservoir (cistern) to the nasal cavity or ear. Understanding the dynamics of CSF is crucial, as it is produced in the lateral ventricles and flows through various structures, including the foramen of Monro, the third and fourth ventricles, and into the subarachnoid spaces. The movement of CSF is influenced by several factors, including pressure gradients and pulsatile motion associated with the cardiac cycle. During the SPECT procedure, the patient is positioned on an imaging table, and gamma cameras are utilized to capture detailed images of the CSF flow, which are then processed to create a three-dimensional representation of the spinal canal, ventricles, and cisterns. The results of the imaging study are interpreted by a physician, who subsequently provides a comprehensive written report detailing the findings.